Author Topic: cb 750 rim selection  (Read 917 times)

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Offline zoom74cb

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cb 750 rim selection
« on: February 07, 2013, 03:01:05 PM »
Just wondering...has anybody used 40 hole BSA, Triumph,Etc rims laced to the stock cb 750 hubs?????  Found some nice 40 hole 18 and 19 inch ones for a good price..SHINY ALUMINUM!!

Offline Bodi

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Re: cb 750 rim selection
« Reply #1 on: February 08, 2013, 07:18:24 AM »
There are too many variables to answer this easily. Brit bike hubs have several variants. Some are asymmetrical with weird "cone" drum brakes for example: one flange is about 6 inches and the other around 3 inches. The rim spoke holes, especially in alloy hubs where the metal is thicker than with steel, must be drilled so the spoke nipples point at the corresponding spoke holes in the hub. That means a rim drilled for a large diameter drum brake hub is not usable on a typical Honda front hub with disk brake. The hub flange width is also a factor, but usually the difference is not critical. Also some of these bikes have a fairly large hub/rim axial offset, Honda rims are almost always centred on the hub.  If the spokes are not drilled in correct alignment, the spokes will be highly stressed at the nipple making them difficult to tension properly - and prone to failure.
Rims for later model UK bikes with disk brakes should work but I haven't tried. It's always safest to get an alloy rim drilled to suit your specific hub. There are good wheel shops and suppliers that do this. You also have to get the right hole diameter for the spoke nipples you will use, there are quite a few types and sizes.

Offline crazypj

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Re: cb 750 rim selection
« Reply #2 on: February 08, 2013, 07:40:30 AM »
I've never worried about hole angles, they are the simplest things to change.
Unless you find WM3 for front (2.15") and WM4 for rear (2.50") I wouldn't bother, going to narrower rims just isn't worth the time, money and effort
 BTW, flanged rims are a real pain to keep clean (but I still use them because they do look good  ;))
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Offline PeWe

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Re: cb 750 rim selection
« Reply #3 on: February 09, 2013, 02:19:29 PM »
Alu rims in Borrani style here! http://www.motocicliveloci.it/italiano/catalogo/cerchiborrani.htm
Look very nice.
I was going to order here but went for same model I used before, DID compl kits OEM style from CMSNL.

EDIT:
English version of the site: http://www.motocicliveloci.it/inglese/catalogue/cerchiborrani_uk.htm
« Last Edit: February 10, 2013, 12:45:24 AM by PeWe »
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline crazypj

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Re: cb 750 rim selection
« Reply #4 on: February 09, 2013, 04:19:53 PM »
Nice, going to have to bookmark that  ;)
 The prices are pretty reasonable (but I'll bet the shipping is a deal killer?)
I fake being smart pretty good
'you can take my word for it or argue until you find out I'm right'